<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style type="text/css">

        *{
            margin: 0;
            padding: 0;
        }

        span, a, b, strong{
            display: inline-block;
            width: 100px;
            height: 100px;
            border: 6px solid #000000;
            padding: 20px;
            margin: 20px;
        }

    </style>
</head>
<body>
<span>SPAN</span>
<a href="">超链接</a>
<b>加粗</b>
<strong>强调</strong>

</body>
</html>